What was she contemplating during that tranquil moment of reflection? Her caption offers a hint: "With great power comes great responsibility."

That's a line from Marvel's "Spider-Man," issued as a warning from the superhero's uncle, Ben Parker. But it's not hard to imagine how it might apply to a powerful personality like Williams who's approaching one of life's biggest responsibilities.

A few days ago, Williams shared another glimpse of shore-side fun from a few months earlier.